JPS6293080A - Joining method for amorphous coating member - Google Patents

Abstract

PURPOSE:To improve the strength, rigidity and corrosion resistance of a member by cooling the vicinity of a terminal edge part of an amorphous coating film, holding its end edge part at a lower temperature than a temperature of crystallization of an amorphous metal, and welding it. CONSTITUTION:When welding an amorphous coating member 1 and the other side member 3 of a stainless steel material, etc., the vicinity of a terminal edge part 2a of an amorphous coating film 2 is cooled, and it is held at a lower temperature than a temperature of crystallization of an amorphous metal. In this case, the range extending from >=about 10mm to the coating film 2 side from the terminal edge part 2a, to about 4-5mm to a weld zone 4 side is cooled. By this cooling, the amorphous metal of the coating film 2 is prevented from being varied from an amorphous substance to a crystalline substance. Accordingly, the weld zone 4 can be formed without deteriorating the characteristic of the coating film 2. Therefore, the strength, rigidity and corrosion resistance of the member can be improved.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a method for joining amorphous coating members, and particularly relates to a method for joining members having an amorphous coating film.
It can be welded to other members without damaging the properties of the coating film. The present invention relates to a method for joining amorphous coating members.

[Conventional technology] Fu +1 + Fu - Fu A door I country k
It is a metal with an amorphous structure that has no regularity, and has physical and chemical properties that are not found in crystalline metals.For this reason, In recent years, there has been active research and development into various parts in which the surfaces of parts are coated with amorphous metals to significantly improve the surface properties of the parts, taking advantage of their properties such as high hardness, high corrosion resistance, and high magnetic permeability. Vapor phase deposition methods such as sputtering and vacuum deposition are generally known as methods for coating amorphous metal.

By the way, since it is difficult to apply amorphous coating to excessively complicated irregularly shaped places, narrow spaces, or huge structures, it is possible to form a structure of a desired shape or size by joining members that have been previously coated with amorphous coating. It becomes necessary to manufacture.

[Problems to be Solved by the Invention] However, when welding members coated with an amorphous coating, the coating film is heated by the heat generated by welding, and the amorphous metal in the coating film changes from amorphous to crystalline. As a result, the properties of amorphous metals may be lost. Furthermore, there is a possibility that the coating film may be peeled off or damaged due to this thermal type τ.

[Means to solve problems] The present invention aims to solve such problems.

Amorphous metal T near the joint! - When welding a member having a coating film to another member, the vicinity of the terminal edge of the amorphous coating film on the welding part side is cooled to maintain the terminal edge at a temperature lower than the crystallization temperature of the amorphous metal. This is how it was done.

[Function] In order to cool the vicinity of the terminal edge of the amorphous coating film on the welding part side and maintain the terminal edge at a temperature lower than the crystallization temperature of the amorphous metal, the coating film is heated by the heat generated by welding. This prevents the amorphous metal in the coating film from changing from amorphous to crystalline.
The properties of amorphous metal are not impaired. Further, the coating film will not peel off or be damaged due to thermal effects.

It is known that when welding members, cooling water is injected into the vicinity of the weld to cool the weld to maintain the integrity of the structure of the weld. (For example, Atomic Crab Science 24-9 (1978
), 9-16. Or anti-corrosion technology 32.83-90 (
(1983)) However, when welding parts whose surfaces are coated with an amorphous coating, it is necessary to cool the area where the heat is transmitted to prevent crystallization of the amorphous metal, regardless of the presence or absence of the welding heat impact on the base metal. No attempt has been made to prevent it. According to the present invention, the amorphous coating is cooled regardless of the influence of welding heat on the base metal.

The cooling temperature is also below the crystallization temperature of the amorphous metal. By performing such cooling, it is possible to prevent crystallization and deterioration of the amorphous coating in the vicinity of the weld.

The present invention will be described in more detail below with reference to embodiments shown in the drawings.

Note that in this specification, amorphous metal includes not only a single metal but also an amorphous metal alloy.

FIG. 1 is a diagram showing a cross section of a member and its temperature gradient for explaining an embodiment method of the present invention.

3 is an amorphous coating member having a coating film 2 of an amorphous metal, and 3 is a mating member to be joined to the amorphous coating member. Moreover, 4 is a welding part.

In the present invention, when welding the amorphous coating member l to the mating member 3, the vicinity of the terminal edge 2a of the amorphous coating film 2 on the side of the welding part 4 is cooled, and the terminal edge 2a is heated to form a crystallized amorphous metal. Hold the temperature below the temperature.

The method of the present invention is extremely effective for joining members in which an amorphous coating film is formed near the part to be welded, for example, at a position up to about 10 mm from the weld line.

Any method may be used, such as spraying a liquid, but water cooling is particularly preferred.

The area to be cooled varies depending on the distance between the welded part 4 and the interlocking edge 2a of the amorphous coating Ilu 2, but is usually 5 m from the terminal edge 2a to the welded part 4.
About m, coating from the terminal edge 2a! It is preferable to cool an area of about 1) mm or more toward the 22 side. By cooling in this manner, the terminal edge 2a of the coating film 2 is cooled and maintained below the crystallization temperature of the amorphous metal, as shown by the temperature gradient on the right side of FIG.

In addition, in the present invention, the amorphous coating member 2
The materials of the base material and the counterpart member 3 are not particularly limited, and various materials such as stainless steel and mild steel can be used. Furthermore, the present invention can be applied to any size of these members, from small to large. Furthermore, the counterpart member 3 may also be coated with an amorphous coating. In this case, a corresponding portion of the counterpart member 3 is also cooled.

There are no particular restrictions on the composition of the amorphous metal in the amorphous coating film, and various types may be used. The composition of this amorphous metal is M-X or M-X-Y (
M: Base metal or alloy, x: Corrosion resistance and hardness≠
1M is, for example, F
e, Ni, Cu or alloys thereof, or Cr, T
a, Ti, W, Z r, N b or two or more types, Y
As such, P, B, C, etc. are used, and those containing these in appropriate proportions are used.

In the present invention, a common method is adopted as a welding method for the amorphous coated member 1 and the phase/L actual member 3. Examples of welding methods include arc welding, plasma welding, laser welding, electron beam welding, and high frequency welding.

[Example] Next, specific examples will be described.

Example 1 A member was coated with an amorphous coating (Fe-35%Ta) with a thickness of 0.040 mm on a stainless steel plate so that the distance between the welded part and the end edge of the coating film was 5 mm. A stainless steel plate, which had not been used, was welded according to the method of the present invention shown in FIG. Note that the cooling is performed by water cooling to cool the terminal edge 2 of the coating film 2.
The test was carried out over a width of 20 mm centering on a.

Further, the welding method and welding conditions are as follows.

Welding method: TIG arc welding Welding conditions: Filler wire used (1.2mmφ) Current/
...150A Voltage...14V Speed -1Q Cm/min The coating film of the obtained joining member did not change at all, and its characteristics were investigated and found as shown in Table 1.

Comparative Example 1 Welding was carried out in the same manner as in Example 1 except that water cooling was not performed.

When the properties of the coating film in this case were investigated after welding, the properties of the film were as shown in Table 1 below, and the properties of the film were significantly reduced.Table 1 From the above, according to the method of the present invention, It is clear that amorphous coating members can be bonded well without impairing the properties of the coating film.

[Effects of the Invention] As described above, according to the present invention, it is possible to easily join an amorphous coating member to a mating member without impairing the characteristics of the amorphous coating film. For this reason, it has become possible to produce members with complex irregular shapes with amorphous coating films, and structures with excellent properties such as #erodibility, high strength, and high toughness can be easily obtained, which is extremely advantageous industrially. be.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating an embodiment method of the present invention. 1...Amorphous coating member. 2... Amorphous coating film, 3... Opposite member, 4... Welded part. Agent Patent Attorney Tsuyoshi Shigeno Amorphous Coating Film

Claims (1)

[Claims] (1) When welding a member having an amorphous metal coating film near the joint to another member, the vicinity of the terminal edge of the amorphous coating film on the welding part side is cooled, and the terminal edge becomes amorphous metal crystal. A method for joining amorphous coated members, the method comprising maintaining the temperature at a temperature lower than the temperature at which the amorphous coated member oxidizes.